After months of being the subject of tabloid speculation about a possible romance, Amber Heard and Elon Musk let the world know that they are more than just friends by showing some PDA on social media Sunday.

Heard, 30, and Musk, 45, posted similar Instagram photos of the two of them together at a restaurant in Australia, looking cozy and with Musk sporting a discernible lipstick smooch mark on his cheek.

The actress captioned her photo “Cheeky.”

The billionaire Tesla and SpaceX boss, meanwhile, broke with his tradition of mostly just sharing work-related photos on his Instagram account, showing a photo of Heard’s arm draped over his shoulder. For his 1.3 million followers, he captained his photo “Having moo moo at Moo Moo Gold Coast with @AmberHeard, @CreepyPuppet and @CowanFilms.”

Moo Moo is a well-regarded steak house on Australia’s Gold Cost, south of Brisbane.

Heard, whose nasty divorce from Johnny Depp was finalized last year, is in Australia filming her upcoming movie “Aquaman.” She and Musk went public with their romance for the first time Sunday, starting with the two walking arm-in-arm while visiting the Gold Coast’s Currumbin Wildlife Sanctuary, TMZ and other outlets reported.

The pair also held hands and took part in the sanctuary’s TreeTop Challenge zip lining ropes courses.

The Hollywood beauty and the co-founder and CEO of Palo Alto-based Tesla Inc. were first linked last summer after they were spotted out and about in London and Miami. Musk, who is worth an estimated $14 billion, has previously been married twice and has five sons with his first wife. He just got out of a second marriage to British actress Talulah Riley, 31.

Musk supposedly became “infatuated” with “The Rum Diary” actress after the two appeared together in the 2013 film “Machete Kills,” according to the Hollywood Reporter. Although the pair did not get a chance to meet on set, Musk, who had a cameo in the movie, was said to have emailed director Robert Rodriguez repeatedly in the hope that he could set up a meeting between himself and the actress. He pursued Heard despite the fact that she was in a relationship with Depp at the time.

Heard eventually married Depp, 53, in 2015 but the marriage only lasted 15 months. She filed for divorce from him last May, amid allegations that she suffered abuse at the hands of the Oscar-nominated actor — which Depp denied. Their separation was finalized in January, with Depp agreeing to hand over $7 million. Heard stated that she would donate the entire proceeds from the divorce to the American Civil Liberties Union and the Children’s Hospital Los Angeles.

Within months of filing for divorce from Depp, Heard supposedly became “smitten” with the South African-born Musk.

The two were most recently spotted in Palo Alto in February, attending a VIP screening of Al Gore’s new documentary, “An Inconvenient Sequel: Truth to Power.”

Rumors have been swirling for months that SpaceX founder Elon Musk and actress Amber Heard have been dating. But it looks like they’ve finally made that news official. Well, Instagram-official, anyway.

Musk and Heard both posted photos to their Instagram accounts last night showing the couple at the restaurant Moo Moo on the Gold Coast of Australia. Heard is in Australia filming the upcoming movie Aquaman. Heard is playing Mera, Queen of Atlantis. And Musk? Well, it would appear that Musk is in Australia for Heard.

But you have to ask yourself, have they had that conversation yet? You know the one. No, not whether they’re ready to get married or even whether they love each other. I’m talking about the most important question Elon can ask any woman he’s involved with: Will they die on Mars together?

Amber Heard’s photo on Instagram was simply captioned “Cheeky.” If you take a close look at Musk’s cheek you’ll notice red lipstick.

Elon Musk’s photo had a bit more info, with the caption, “Having moo moo at Moo Moo Gold Coast with @AmberHeard, @CreepyPuppet and @CowanFilms.”

But neither of their photos addressed the very important question of whether they’re ready to take their relationship to the next level. By which I mean the level of spending 18 months in a space capsule together before reaching Mars and eventually dying on the red planet.

Elon Musk is a pretty busy guy, as the head of the space company SpaceX, the head of the car company Tesla, and even making himself CEO of a new company that’s working on what amounts to telepathy, Neuralink. Oh, and he also wants to dig tunnels under LA and fly to Mars and is advising President Trump.

But he’s not too busy for a social life—and a quite robust one at that. Musk has six sons with his first wife Justine and has been married and divorced twice to Talulah Riley. Musk’s second divorce to Riley was finalized last year. Heard’s divorce to Johnny Depp was finalized last summer. But none of their respective partners ever asked each other to die on a planet 249 million miles away, as far as we know.

It looks like if Heard (31) and Musk (45) stick together, they would presumably make the trip to Mars in their old age. Musk has said that he’d like to die on Mars. If they eventually do get married one has to wonder if that’ll be in the prenup.

“Irreconcilable desires to die on Mars versus Earth” would probably be the best reason ever for divorce though. Or “I don’t want to spend a year and a half in a space capsule with you watching you shit into a bag before we land on an uninhabitable planet together and die a horrible, horrible death.” Both pretty good reasons to split, if you ask me.

It could not be confirmed by press time whether Amber Heard was ready to spend a year and a half shitting into a bag to then go die a horrible death on Mars.

Amber Heard has moved on from multimillionaire actor Johnny Depp with a billionaire inventor.

The "Rum Diary" actress posted a photo of herself on Instagram at dinner with Tesla Motors founder Elon Musk. In said shot, Musk is sporting a lipstick smudge on his cheek that could only have come from his red-lipped dinner companion.

Musk and Heard have been rumored to be an item after being spotted together several times over the past months.

Heard, who turned 31 on Saturday, divorced Depp in 2016 after two years of marriage. She reportedly received a $7 million divorce settlment.